[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: RE: Namespaces Best Practice
Paul Spencer wrote: > I'm late coming to this thread, but am I the only one to disagree with point > 1? (I agree totally with 2.) This is a bit of a struggle for me too. One analogy would be the programming practice that says "declare variables where you use them." Why have a namespace declaration at the top of the document, when you're only using that namespace at one isolated element in the middle of the document? More significant than an analogy with programming practice is how XPath and XSLT model namespaces. For every in-scope namespace binding at a given element, there is a namespace node. This has two immediate practical implications: 1) performance may degrade as the number of namespace nodes proliferates, and 2) any copy of that element into the result tree will include all of its namespace nodes. I personally am more concerned with #2. More than once have I resorted to writing the following: <xsl:template match="/"> <xsl:apply-templates select="foo/bar"/> </xsl:template> <xsl:template match="*"> <xsl:element name="{name()}" namespace="{namespace-uri()}"> <xsl:apply-templates select="node()|@*"/> </xsl:element> </xsl:template> <xsl:template match="@*|text()|comment()|processing-instruction()"> <xsl:copy/> </xsl:template> ...when the only reason I didn't just write <xsl:copy-of select="foo/bar"/> is because I didn't want to include all of the extraneous namespace declarations in my output. Perhaps this is a way of forcing me into a good XSLT practice (always using template rules), but I admit that when I've had control over the source document, I've sometimes taken the simpler approach of moving namespace declarations away from the root element and down to the point where they are actually needed. Evan Lenz XYZFind Corp.
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